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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<span class="sourceLineNo">003</span> * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<span class="sourceLineNo">004</span> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<span class="sourceLineNo">005</span> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<span class="sourceLineNo">006</span> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<span class="sourceLineNo">007</span> * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<span class="sourceLineNo">012</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<span class="sourceLineNo">014</span> * See the License for the specific language governing permissions and<a name="line.14"></a>
<span class="sourceLineNo">015</span> * limitations under the License.<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>package org.apache.commons.codec.binary;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.util.Arrays;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.apache.commons.codec.BinaryDecoder;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.apache.commons.codec.BinaryEncoder;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.apache.commons.codec.DecoderException;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.commons.codec.EncoderException;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>/**<a name="line.27"></a>
<span class="sourceLineNo">028</span> * Abstract superclass for Base-N encoders and decoders.<a name="line.28"></a>
<span class="sourceLineNo">029</span> *<a name="line.29"></a>
<span class="sourceLineNo">030</span> * &lt;p&gt;<a name="line.30"></a>
<span class="sourceLineNo">031</span> * This class is thread-safe.<a name="line.31"></a>
<span class="sourceLineNo">032</span> * &lt;/p&gt;<a name="line.32"></a>
<span class="sourceLineNo">033</span> *<a name="line.33"></a>
<span class="sourceLineNo">034</span> * @version $Id: BaseNCodec.java 1634404 2014-10-26 23:06:10Z ggregory $<a name="line.34"></a>
<span class="sourceLineNo">035</span> */<a name="line.35"></a>
<span class="sourceLineNo">036</span>public abstract class BaseNCodec implements BinaryEncoder, BinaryDecoder {<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    /**<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * Holds thread context so classes can be thread-safe.<a name="line.39"></a>
<span class="sourceLineNo">040</span>     *<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * This class is not itself thread-safe; each thread must allocate its own copy.<a name="line.41"></a>
<span class="sourceLineNo">042</span>     *<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * @since 1.7<a name="line.43"></a>
<span class="sourceLineNo">044</span>     */<a name="line.44"></a>
<span class="sourceLineNo">045</span>    static class Context {<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>        /**<a name="line.47"></a>
<span class="sourceLineNo">048</span>         * Place holder for the bytes we're dealing with for our based logic.<a name="line.48"></a>
<span class="sourceLineNo">049</span>         * Bitwise operations store and extract the encoding or decoding from this variable.<a name="line.49"></a>
<span class="sourceLineNo">050</span>         */<a name="line.50"></a>
<span class="sourceLineNo">051</span>        int ibitWorkArea;<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span>        /**<a name="line.53"></a>
<span class="sourceLineNo">054</span>         * Place holder for the bytes we're dealing with for our based logic.<a name="line.54"></a>
<span class="sourceLineNo">055</span>         * Bitwise operations store and extract the encoding or decoding from this variable.<a name="line.55"></a>
<span class="sourceLineNo">056</span>         */<a name="line.56"></a>
<span class="sourceLineNo">057</span>        long lbitWorkArea;<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>        /**<a name="line.59"></a>
<span class="sourceLineNo">060</span>         * Buffer for streaming.<a name="line.60"></a>
<span class="sourceLineNo">061</span>         */<a name="line.61"></a>
<span class="sourceLineNo">062</span>        byte[] buffer;<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>        /**<a name="line.64"></a>
<span class="sourceLineNo">065</span>         * Position where next character should be written in the buffer.<a name="line.65"></a>
<span class="sourceLineNo">066</span>         */<a name="line.66"></a>
<span class="sourceLineNo">067</span>        int pos;<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>        /**<a name="line.69"></a>
<span class="sourceLineNo">070</span>         * Position where next character should be read from the buffer.<a name="line.70"></a>
<span class="sourceLineNo">071</span>         */<a name="line.71"></a>
<span class="sourceLineNo">072</span>        int readPos;<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>        /**<a name="line.74"></a>
<span class="sourceLineNo">075</span>         * Boolean flag to indicate the EOF has been reached. Once EOF has been reached, this object becomes useless,<a name="line.75"></a>
<span class="sourceLineNo">076</span>         * and must be thrown away.<a name="line.76"></a>
<span class="sourceLineNo">077</span>         */<a name="line.77"></a>
<span class="sourceLineNo">078</span>        boolean eof;<a name="line.78"></a>
<span class="sourceLineNo">079</span><a name="line.79"></a>
<span class="sourceLineNo">080</span>        /**<a name="line.80"></a>
<span class="sourceLineNo">081</span>         * Variable tracks how many characters have been written to the current line. Only used when encoding. We use<a name="line.81"></a>
<span class="sourceLineNo">082</span>         * it to make sure each encoded line never goes beyond lineLength (if lineLength &amp;gt; 0).<a name="line.82"></a>
<span class="sourceLineNo">083</span>         */<a name="line.83"></a>
<span class="sourceLineNo">084</span>        int currentLinePos;<a name="line.84"></a>
<span class="sourceLineNo">085</span><a name="line.85"></a>
<span class="sourceLineNo">086</span>        /**<a name="line.86"></a>
<span class="sourceLineNo">087</span>         * Writes to the buffer only occur after every 3/5 reads when encoding, and every 4/8 reads when decoding. This<a name="line.87"></a>
<span class="sourceLineNo">088</span>         * variable helps track that.<a name="line.88"></a>
<span class="sourceLineNo">089</span>         */<a name="line.89"></a>
<span class="sourceLineNo">090</span>        int modulus;<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>        Context() {<a name="line.92"></a>
<span class="sourceLineNo">093</span>        }<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>
<span class="sourceLineNo">095</span>        /**<a name="line.95"></a>
<span class="sourceLineNo">096</span>         * Returns a String useful for debugging (especially within a debugger.)<a name="line.96"></a>
<span class="sourceLineNo">097</span>         *<a name="line.97"></a>
<span class="sourceLineNo">098</span>         * @return a String useful for debugging.<a name="line.98"></a>
<span class="sourceLineNo">099</span>         */<a name="line.99"></a>
<span class="sourceLineNo">100</span>        @SuppressWarnings("boxing") // OK to ignore boxing here<a name="line.100"></a>
<span class="sourceLineNo">101</span>        @Override<a name="line.101"></a>
<span class="sourceLineNo">102</span>        public String toString() {<a name="line.102"></a>
<span class="sourceLineNo">103</span>            return String.format("%s[buffer=%s, currentLinePos=%s, eof=%s, ibitWorkArea=%s, lbitWorkArea=%s, " +<a name="line.103"></a>
<span class="sourceLineNo">104</span>                    "modulus=%s, pos=%s, readPos=%s]", this.getClass().getSimpleName(), Arrays.toString(buffer),<a name="line.104"></a>
<span class="sourceLineNo">105</span>                    currentLinePos, eof, ibitWorkArea, lbitWorkArea, modulus, pos, readPos);<a name="line.105"></a>
<span class="sourceLineNo">106</span>        }<a name="line.106"></a>
<span class="sourceLineNo">107</span>    }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>    /**<a name="line.109"></a>
<span class="sourceLineNo">110</span>     * EOF<a name="line.110"></a>
<span class="sourceLineNo">111</span>     *<a name="line.111"></a>
<span class="sourceLineNo">112</span>     * @since 1.7<a name="line.112"></a>
<span class="sourceLineNo">113</span>     */<a name="line.113"></a>
<span class="sourceLineNo">114</span>    static final int EOF = -1;<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>
<span class="sourceLineNo">116</span>    /**<a name="line.116"></a>
<span class="sourceLineNo">117</span>     *  MIME chunk size per RFC 2045 section 6.8.<a name="line.117"></a>
<span class="sourceLineNo">118</span>     *<a name="line.118"></a>
<span class="sourceLineNo">119</span>     * &lt;p&gt;<a name="line.119"></a>
<span class="sourceLineNo">120</span>     * The {@value} character limit does not count the trailing CRLF, but counts all other characters, including any<a name="line.120"></a>
<span class="sourceLineNo">121</span>     * equal signs.<a name="line.121"></a>
<span class="sourceLineNo">122</span>     * &lt;/p&gt;<a name="line.122"></a>
<span class="sourceLineNo">123</span>     *<a name="line.123"></a>
<span class="sourceLineNo">124</span>     * @see &lt;a href="http://www.ietf.org/rfc/rfc2045.txt"&gt;RFC 2045 section 6.8&lt;/a&gt;<a name="line.124"></a>
<span class="sourceLineNo">125</span>     */<a name="line.125"></a>
<span class="sourceLineNo">126</span>    public static final int MIME_CHUNK_SIZE = 76;<a name="line.126"></a>
<span class="sourceLineNo">127</span><a name="line.127"></a>
<span class="sourceLineNo">128</span>    /**<a name="line.128"></a>
<span class="sourceLineNo">129</span>     * PEM chunk size per RFC 1421 section 4.3.2.4.<a name="line.129"></a>
<span class="sourceLineNo">130</span>     *<a name="line.130"></a>
<span class="sourceLineNo">131</span>     * &lt;p&gt;<a name="line.131"></a>
<span class="sourceLineNo">132</span>     * The {@value} character limit does not count the trailing CRLF, but counts all other characters, including any<a name="line.132"></a>
<span class="sourceLineNo">133</span>     * equal signs.<a name="line.133"></a>
<span class="sourceLineNo">134</span>     * &lt;/p&gt;<a name="line.134"></a>
<span class="sourceLineNo">135</span>     *<a name="line.135"></a>
<span class="sourceLineNo">136</span>     * @see &lt;a href="http://tools.ietf.org/html/rfc1421"&gt;RFC 1421 section 4.3.2.4&lt;/a&gt;<a name="line.136"></a>
<span class="sourceLineNo">137</span>     */<a name="line.137"></a>
<span class="sourceLineNo">138</span>    public static final int PEM_CHUNK_SIZE = 64;<a name="line.138"></a>
<span class="sourceLineNo">139</span><a name="line.139"></a>
<span class="sourceLineNo">140</span>    private static final int DEFAULT_BUFFER_RESIZE_FACTOR = 2;<a name="line.140"></a>
<span class="sourceLineNo">141</span><a name="line.141"></a>
<span class="sourceLineNo">142</span>    /**<a name="line.142"></a>
<span class="sourceLineNo">143</span>     * Defines the default buffer size - currently {@value}<a name="line.143"></a>
<span class="sourceLineNo">144</span>     * - must be large enough for at least one encoded block+separator<a name="line.144"></a>
<span class="sourceLineNo">145</span>     */<a name="line.145"></a>
<span class="sourceLineNo">146</span>    private static final int DEFAULT_BUFFER_SIZE = 8192;<a name="line.146"></a>
<span class="sourceLineNo">147</span><a name="line.147"></a>
<span class="sourceLineNo">148</span>    /** Mask used to extract 8 bits, used in decoding bytes */<a name="line.148"></a>
<span class="sourceLineNo">149</span>    protected static final int MASK_8BITS = 0xff;<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>    /**<a name="line.151"></a>
<span class="sourceLineNo">152</span>     * Byte used to pad output.<a name="line.152"></a>
<span class="sourceLineNo">153</span>     */<a name="line.153"></a>
<span class="sourceLineNo">154</span>    protected static final byte PAD_DEFAULT = '='; // Allow static access to default<a name="line.154"></a>
<span class="sourceLineNo">155</span><a name="line.155"></a>
<span class="sourceLineNo">156</span>    /**<a name="line.156"></a>
<span class="sourceLineNo">157</span>     * @deprecated Use {@link #pad}. Will be removed in 2.0.<a name="line.157"></a>
<span class="sourceLineNo">158</span>     */<a name="line.158"></a>
<span class="sourceLineNo">159</span>    @Deprecated<a name="line.159"></a>
<span class="sourceLineNo">160</span>    protected final byte PAD = PAD_DEFAULT; // instance variable just in case it needs to vary later<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span>    protected final byte pad; // instance variable just in case it needs to vary later<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>    /** Number of bytes in each full block of unencoded data, e.g. 4 for Base64 and 5 for Base32 */<a name="line.164"></a>
<span class="sourceLineNo">165</span>    private final int unencodedBlockSize;<a name="line.165"></a>
<span class="sourceLineNo">166</span><a name="line.166"></a>
<span class="sourceLineNo">167</span>    /** Number of bytes in each full block of encoded data, e.g. 3 for Base64 and 8 for Base32 */<a name="line.167"></a>
<span class="sourceLineNo">168</span>    private final int encodedBlockSize;<a name="line.168"></a>
<span class="sourceLineNo">169</span><a name="line.169"></a>
<span class="sourceLineNo">170</span>    /**<a name="line.170"></a>
<span class="sourceLineNo">171</span>     * Chunksize for encoding. Not used when decoding.<a name="line.171"></a>
<span class="sourceLineNo">172</span>     * A value of zero or less implies no chunking of the encoded data.<a name="line.172"></a>
<span class="sourceLineNo">173</span>     * Rounded down to nearest multiple of encodedBlockSize.<a name="line.173"></a>
<span class="sourceLineNo">174</span>     */<a name="line.174"></a>
<span class="sourceLineNo">175</span>    protected final int lineLength;<a name="line.175"></a>
<span class="sourceLineNo">176</span><a name="line.176"></a>
<span class="sourceLineNo">177</span>    /**<a name="line.177"></a>
<span class="sourceLineNo">178</span>     * Size of chunk separator. Not used unless {@link #lineLength} &amp;gt; 0.<a name="line.178"></a>
<span class="sourceLineNo">179</span>     */<a name="line.179"></a>
<span class="sourceLineNo">180</span>    private final int chunkSeparatorLength;<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span>    /**<a name="line.182"></a>
<span class="sourceLineNo">183</span>     * Note &lt;code&gt;lineLength&lt;/code&gt; is rounded down to the nearest multiple of {@link #encodedBlockSize}<a name="line.183"></a>
<span class="sourceLineNo">184</span>     * If &lt;code&gt;chunkSeparatorLength&lt;/code&gt; is zero, then chunking is disabled.<a name="line.184"></a>
<span class="sourceLineNo">185</span>     * @param unencodedBlockSize the size of an unencoded block (e.g. Base64 = 3)<a name="line.185"></a>
<span class="sourceLineNo">186</span>     * @param encodedBlockSize the size of an encoded block (e.g. Base64 = 4)<a name="line.186"></a>
<span class="sourceLineNo">187</span>     * @param lineLength if &amp;gt; 0, use chunking with a length &lt;code&gt;lineLength&lt;/code&gt;<a name="line.187"></a>
<span class="sourceLineNo">188</span>     * @param chunkSeparatorLength the chunk separator length, if relevant<a name="line.188"></a>
<span class="sourceLineNo">189</span>     */<a name="line.189"></a>
<span class="sourceLineNo">190</span>    protected BaseNCodec(final int unencodedBlockSize, final int encodedBlockSize,<a name="line.190"></a>
<span class="sourceLineNo">191</span>                         final int lineLength, final int chunkSeparatorLength) {<a name="line.191"></a>
<span class="sourceLineNo">192</span>        this(unencodedBlockSize, encodedBlockSize, lineLength, chunkSeparatorLength, PAD_DEFAULT);<a name="line.192"></a>
<span class="sourceLineNo">193</span>    }<a name="line.193"></a>
<span class="sourceLineNo">194</span><a name="line.194"></a>
<span class="sourceLineNo">195</span>    /**<a name="line.195"></a>
<span class="sourceLineNo">196</span>     * Note &lt;code&gt;lineLength&lt;/code&gt; is rounded down to the nearest multiple of {@link #encodedBlockSize}<a name="line.196"></a>
<span class="sourceLineNo">197</span>     * If &lt;code&gt;chunkSeparatorLength&lt;/code&gt; is zero, then chunking is disabled.<a name="line.197"></a>
<span class="sourceLineNo">198</span>     * @param unencodedBlockSize the size of an unencoded block (e.g. Base64 = 3)<a name="line.198"></a>
<span class="sourceLineNo">199</span>     * @param encodedBlockSize the size of an encoded block (e.g. Base64 = 4)<a name="line.199"></a>
<span class="sourceLineNo">200</span>     * @param lineLength if &amp;gt; 0, use chunking with a length &lt;code&gt;lineLength&lt;/code&gt;<a name="line.200"></a>
<span class="sourceLineNo">201</span>     * @param chunkSeparatorLength the chunk separator length, if relevant<a name="line.201"></a>
<span class="sourceLineNo">202</span>     * @param pad byte used as padding byte.<a name="line.202"></a>
<span class="sourceLineNo">203</span>     */<a name="line.203"></a>
<span class="sourceLineNo">204</span>    protected BaseNCodec(final int unencodedBlockSize, final int encodedBlockSize,<a name="line.204"></a>
<span class="sourceLineNo">205</span>                         final int lineLength, final int chunkSeparatorLength, final byte pad) {<a name="line.205"></a>
<span class="sourceLineNo">206</span>        this.unencodedBlockSize = unencodedBlockSize;<a name="line.206"></a>
<span class="sourceLineNo">207</span>        this.encodedBlockSize = encodedBlockSize;<a name="line.207"></a>
<span class="sourceLineNo">208</span>        final boolean useChunking = lineLength &gt; 0 &amp;&amp; chunkSeparatorLength &gt; 0;<a name="line.208"></a>
<span class="sourceLineNo">209</span>        this.lineLength = useChunking ? (lineLength / encodedBlockSize) * encodedBlockSize : 0;<a name="line.209"></a>
<span class="sourceLineNo">210</span>        this.chunkSeparatorLength = chunkSeparatorLength;<a name="line.210"></a>
<span class="sourceLineNo">211</span><a name="line.211"></a>
<span class="sourceLineNo">212</span>        this.pad = pad;<a name="line.212"></a>
<span class="sourceLineNo">213</span>    }<a name="line.213"></a>
<span class="sourceLineNo">214</span><a name="line.214"></a>
<span class="sourceLineNo">215</span>    /**<a name="line.215"></a>
<span class="sourceLineNo">216</span>     * Returns true if this object has buffered data for reading.<a name="line.216"></a>
<span class="sourceLineNo">217</span>     *<a name="line.217"></a>
<span class="sourceLineNo">218</span>     * @param context the context to be used<a name="line.218"></a>
<span class="sourceLineNo">219</span>     * @return true if there is data still available for reading.<a name="line.219"></a>
<span class="sourceLineNo">220</span>     */<a name="line.220"></a>
<span class="sourceLineNo">221</span>    boolean hasData(final Context context) {  // package protected for access from I/O streams<a name="line.221"></a>
<span class="sourceLineNo">222</span>        return context.buffer != null;<a name="line.222"></a>
<span class="sourceLineNo">223</span>    }<a name="line.223"></a>
<span class="sourceLineNo">224</span><a name="line.224"></a>
<span class="sourceLineNo">225</span>    /**<a name="line.225"></a>
<span class="sourceLineNo">226</span>     * Returns the amount of buffered data available for reading.<a name="line.226"></a>
<span class="sourceLineNo">227</span>     *<a name="line.227"></a>
<span class="sourceLineNo">228</span>     * @param context the context to be used<a name="line.228"></a>
<span class="sourceLineNo">229</span>     * @return The amount of buffered data available for reading.<a name="line.229"></a>
<span class="sourceLineNo">230</span>     */<a name="line.230"></a>
<span class="sourceLineNo">231</span>    int available(final Context context) {  // package protected for access from I/O streams<a name="line.231"></a>
<span class="sourceLineNo">232</span>        return context.buffer != null ? context.pos - context.readPos : 0;<a name="line.232"></a>
<span class="sourceLineNo">233</span>    }<a name="line.233"></a>
<span class="sourceLineNo">234</span><a name="line.234"></a>
<span class="sourceLineNo">235</span>    /**<a name="line.235"></a>
<span class="sourceLineNo">236</span>     * Get the default buffer size. Can be overridden.<a name="line.236"></a>
<span class="sourceLineNo">237</span>     *<a name="line.237"></a>
<span class="sourceLineNo">238</span>     * @return {@link #DEFAULT_BUFFER_SIZE}<a name="line.238"></a>
<span class="sourceLineNo">239</span>     */<a name="line.239"></a>
<span class="sourceLineNo">240</span>    protected int getDefaultBufferSize() {<a name="line.240"></a>
<span class="sourceLineNo">241</span>        return DEFAULT_BUFFER_SIZE;<a name="line.241"></a>
<span class="sourceLineNo">242</span>    }<a name="line.242"></a>
<span class="sourceLineNo">243</span><a name="line.243"></a>
<span class="sourceLineNo">244</span>    /**<a name="line.244"></a>
<span class="sourceLineNo">245</span>     * Increases our buffer by the {@link #DEFAULT_BUFFER_RESIZE_FACTOR}.<a name="line.245"></a>
<span class="sourceLineNo">246</span>     * @param context the context to be used<a name="line.246"></a>
<span class="sourceLineNo">247</span>     */<a name="line.247"></a>
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<span class="sourceLineNo">491</span>     * @param arrayOctet<a name="line.491"></a>
<span class="sourceLineNo">492</span>     *            byte array to test<a name="line.492"></a>
<span class="sourceLineNo">493</span>     * @return &lt;code&gt;true&lt;/code&gt; if any byte is a valid character in the alphabet or PAD; &lt;code&gt;false&lt;/code&gt; otherwise<a name="line.493"></a>
<span class="sourceLineNo">494</span>     */<a name="line.494"></a>
<span class="sourceLineNo">495</span>    protected boolean containsAlphabetOrPad(final byte[] arrayOctet) {<a name="line.495"></a>
<span class="sourceLineNo">496</span>        if (arrayOctet == null) {<a name="line.496"></a>
<span class="sourceLineNo">497</span>            return false;<a name="line.497"></a>
<span class="sourceLineNo">498</span>        }<a name="line.498"></a>
<span class="sourceLineNo">499</span>        for (final byte element : arrayOctet) {<a name="line.499"></a>
<span class="sourceLineNo">500</span>            if (pad == element || isInAlphabet(element)) {<a name="line.500"></a>
<span class="sourceLineNo">501</span>                return true;<a name="line.501"></a>
<span class="sourceLineNo">502</span>            }<a name="line.502"></a>
<span class="sourceLineNo">503</span>        }<a name="line.503"></a>
<span class="sourceLineNo">504</span>        return false;<a name="line.504"></a>
<span class="sourceLineNo">505</span>    }<a name="line.505"></a>
<span class="sourceLineNo">506</span><a name="line.506"></a>
<span class="sourceLineNo">507</span>    /**<a name="line.507"></a>
<span class="sourceLineNo">508</span>     * Calculates the amount of space needed to encode the supplied array.<a name="line.508"></a>
<span class="sourceLineNo">509</span>     *<a name="line.509"></a>
<span class="sourceLineNo">510</span>     * @param pArray byte[] array which will later be encoded<a name="line.510"></a>
<span class="sourceLineNo">511</span>     *<a name="line.511"></a>
<span class="sourceLineNo">512</span>     * @return amount of space needed to encoded the supplied array.<a name="line.512"></a>
<span class="sourceLineNo">513</span>     * Returns a long since a max-len array will require &amp;gt; Integer.MAX_VALUE<a name="line.513"></a>
<span class="sourceLineNo">514</span>     */<a name="line.514"></a>
<span class="sourceLineNo">515</span>    public long getEncodedLength(final byte[] pArray) {<a name="line.515"></a>
<span class="sourceLineNo">516</span>        // Calculate non-chunked size - rounded up to allow for padding<a name="line.516"></a>
<span class="sourceLineNo">517</span>        // cast to long is needed to avoid possibility of overflow<a name="line.517"></a>
<span class="sourceLineNo">518</span>        long len = ((pArray.length + unencodedBlockSize-1)  / unencodedBlockSize) * (long) encodedBlockSize;<a name="line.518"></a>
<span class="sourceLineNo">519</span>        if (lineLength &gt; 0) { // We're using chunking<a name="line.519"></a>
<span class="sourceLineNo">520</span>            // Round up to nearest multiple<a name="line.520"></a>
<span class="sourceLineNo">521</span>            len += ((len + lineLength-1) / lineLength) * chunkSeparatorLength;<a name="line.521"></a>
<span class="sourceLineNo">522</span>        }<a name="line.522"></a>
<span class="sourceLineNo">523</span>        return len;<a name="line.523"></a>
<span class="sourceLineNo">524</span>    }<a name="line.524"></a>
<span class="sourceLineNo">525</span>}<a name="line.525"></a>




























































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